Contents  on 3 August '11


The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

NEOCP Activity  on 3 August '11

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, seventeen were "one nighters." So far The Tracking News has counted a total of 32 listings on the NEOCP today.

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 3 August '11

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2011-P11 - "22:48 UT" - Comet 45P/Honda-Mrkos-Pajdusakova

MPEC 2011-P10 - "12:18 UT" - 2011 OB26

<< DOU on 3 Aug. '11 >>  MPEC 2011-P09 - "06:05 UT" - Daily Orbit Update

Observers  on 3 August '11

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
7057Krisztian Sarneczky via Apache Point Obs. in New Mexico, 2 in MPEC 2011-P09 -- 2002 WW17, 1998 YW5
H21Astronomical Research Obs. Westfield in Illinois, 11 in MPEC 2011-P09 -- 2011 OY17, 2011 OW4, 2011 OR15, 2011 OK5, 2011 OJ5, 2011 OJ10, 2011 OD18, 2011 OC18, 2011 MW2, 2011 LC19, 2011 AO52
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2011-P09 -- 1917
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2011-P09 -- 2011 OR15
151Eschenberg Obs. in Switzerland, 4 in MPEC 2011-P09 -- 2011 OA, 2011 CG2, 2009 AV, 2008 CM
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPEC 2011-P09 -- 2011 OP24, 2011 OD18
203GiaGa Obs. in Italy, 3 in MPEC 2011-P09 -- 2011 OY17, 2011 JA8, 2008 TR10
704LINEAR in New Mexico, 2 in MPEC 2011-P09 -- 2011 OC18, 2006 WP127
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2011-P10 -- 2011 OB26
A13Naef Obs. in Switzerland, 1 in MPEC 2011-P09 -- 3988
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2011-P10 -- 2011 OB26
B38Santa Mama Obs. in Italy, 3 in MPEC 2011-P09 -- 2011 JP29, 68348, 1865
204Schiaparelli Obs. in Italy, 1 in MPEC 2011-P10 -- 2011 OB26
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2011-P09 & 2011-P11 -- 1994 RC, 45P
A78Stia Obs. in Italy, 1 in MPEC 2011-P09 -- 20086
I40TRAPPIST in Chile, 1 in MPEC 2011-P11 -- 45P
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 August '11

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON risk pages.





Notes for Today's Latest Risk Assessments
2011 OB26JPL Sentry16112059-2110283.6e-05-4.99-5.690JPL: "Analysis based on 10 observations spanning 5.9365 days (2011-Jul-28.4734 to 2011-Aug-03.4099)." Diameter approximately 0.026 km. from mean, weighted H=25.6.
2011 OD18JPL Sentry1611R E M O V E DJPL: Risk listing removed at 0951 UTC.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 3 August '11

Times are UTC for when items were noted or added by The Tracking News.

2309Grabbed MPEC 2011-P11 - Comet 45P/Honda-Mrkos-Pajdusakova - see above
1611Noted that JPL Sentry has posted 2011 OB26 as an impact risk - see above
Noted that JPL Sentry has removed 2011 OD18 as an impact risk - see above
Grabbed MPEC 2011-P09 - Daily Orbit Update - see above
Grabbed MPEC 2011-P10 - 2011 OB26 - see above